I agree on this matter, not only that, but having longer aggro range promotes more "fear" in exploring players, something I think everyone can agree on is the lack of fear monsters currently posses.

I am not too sure how the zones work, but I think it's something involving instances, and if the dev team can signify when a monster reaches a new instance that there de-aggro effect would initiate. On top of that, the dev team could work the city guards near the entrances to put some form of life into the world.

Regardless, the range needs to be drastically increased for multiple reasons. Great post!